JP7406523B2 - Sand cleaning equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sediment cleaning device suitable for use in cleaning sediment collected from a sedimentation basin of a sewage treatment plant or a pumping station.

Sediment collected from the settling ponds of sewage treatment plants has sludge and sludge attached to it, such as kitchen garbage, hair, and pieces of cloth, so it is necessary to separate the sludge and sludge from the sludge by washing. For this reason, sand settling and cleaning equipment is used.

Generally, the sand after washing with a sand-settling cleaning device is treated as general waste, and the sludge and sludge are treated as industrial waste. If it were included, the settled sand would be treated as industrial waste, and there was a risk that the disposal cost would be high.

In addition, if a large amount of residue or sludge is included in the sediment after cleaning, odor-filled drops will fall from the hopper that temporarily stores the sediment, causing hygiene problems, and the moisture content of the sediment will increase. Since it becomes heavy, there is also a problem that the frequency of transportation of the settled sand increases.

In order to solve the above problem, in the sand settling and cleaning device described in Patent Document 1, a hollow drum (21) is rotatably installed in a position surrounding the sand charging pipe (5a) of the receiving tank (2), Sediment (4) is introduced into the drum (21) from the sediment input pipe (5a) while rotating the drum (21), and the organic matter adhering to the sediment is removed by the stirring action caused by the rotation of the drum (21) and the dilution action by water. A configuration is proposed in which filth is separated, organic filth is discharged from an overflow weir (19), and sediment is discharged from a receiving tank (2) by a screw conveyor (1), thereby separating residue and sludge attached to the sediment. has been done.

Japanese Patent Application Publication No. 2001-259469

However, in the sand settling and cleaning device described in Patent Document 1, it is necessary to install and rotate a large drum (21), which increases installation costs and running costs, and may lead to an increase in the size of the device. There was also. In addition, some of the sludge separated by the drum (21) settles in the receiving tank (2) to the screw conveyor (1) and is discharged along with the sediment by the screw conveyor (1). There was also a risk that sand cleaning would not be possible.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a sand settling and cleaning device that can clean sand effectively and inexpensively with a simple configuration.

The present invention includes: a sediment cleaning tank that inputs and washes sediment; and a sediment transport conveyor installed at the inner bottom of the sediment cleaning tank so as to be inclined upward from the upstream side to the downstream side in the sediment discharge direction. and carrying out the washed sand fed into the sand washing tank to the outside of the sand washing tank by the sand washing tank, the sand washing apparatus comprising: The upper part is covered with a screen, and the screen is provided with an opening for passing through the settling sand, and the opening for passing through the settling sand has a coarse area on the upstream side of the screen and a narrow area on the downstream side, Further, the apparatus is characterized in that the downstream area is set wider than the upstream area.
For example, the screen may be configured by forming a plurality of openings for passing through the sand in a plate covering the upper part of the sand carrying conveyor, such as a punching metal, or by forming a plurality of openings for passing through the sand, such as a bar screen. A plurality of bars may be installed in parallel with a gap between them. Further, the screen may have various other configurations such as a mesh plate. Further, the screen may be fixed to the sand settling tank or may be detachable. Further, the screen may be a non-powered type or a movable type such as a belt type.
According to the present invention, the screen allows the scum to be separated from the sediment. In other words, it is possible to effectively reduce the amount of sediment in the sand that passes through the screen and is carried out by the sand conveyor, and as a result, the sand that has been carried out can be reliably treated as general waste, and can be disposed of. Costs (export costs) can be reduced.
In addition, since the residue in the sand being carried out can be suppressed, the moisture content of the sand being carried out is reduced, and even if the sand is stored in a sand hopper, for example, drops falling from the sand hopper are suppressed, reducing odor. It is also planned to Further, by reducing the water content, the weight of the settled sand can be reduced, and the transport span (unloading cycle) of the settled sand can be lengthened.
Furthermore, since the present invention has a simple structure in which the upper part of the sand conveyor is covered with a screen, the installation cost can be reduced.

Further, according to the present invention, by forming the openings for passing through the grit in the screen to be narrow, it is difficult for the sediment to pass through, and by providing the openings for passing through the grit to coarse grains, larger grit can pass through the screen and be collected. can do. In addition, by providing the coarse grit passage openings in the upstream area, even sand that cannot pass through the narrow grit passage openings in the downstream area can roll down the slope of the screen towards the upstream side. You can pass through the screen when you reach the upstream area. This effectively prevents sediment from passing through the screen, and at the same time enables smooth passage of settled sand of all sizes.

In addition to the above features, the present invention is characterized in that an air supply means is installed on the lower surface side of the screen for supplying air and discharging it upward from the sand settling openings of the screen.
According to the present invention, it is possible to prevent the sand insertion openings from being blocked (clogged) by the residue that has settled on the screen. At the same time, by supplying air (aeration) into the sand settling and washing tank, a water flow is generated, and the stirring and washing of the sand can be carried out more effectively, and the separation of the sand and residue can be promoted.

In addition to the above-mentioned features, the present invention provides that the air supply means includes an air jet hole provided on the upstream side of the lower surface of the screen, and the air jetted from the air jet hole is directed along the lower surface of the screen. It is characterized in that the air is released from each of the plurality of sand settling openings formed in the screen by guiding it from the upstream side to the downstream side.
According to the present invention, since air is ejected on the upstream side of the lower surface of the screen installed diagonally, air can be supplied to the downstream side of the screen along the lower surface of the screen, and each sediment insert of the entire screen can be supplied with air. Air can be released from the general opening, thereby preventing each sand settling opening from being blocked. In addition, the inside of the sand settling and cleaning tank can be aerated over a wide area and can be stirred.
In addition to the above-mentioned characteristics, the present invention is characterized in that means is provided for applying a water stream to prevent clogging at each of the sand insertion openings of the screen.

According to the present invention, cleaning of settled sand can be performed effectively and inexpensively with a simple configuration.

1 is a schematic side sectional view of the sand settling and cleaning device 1. FIG. It is an enlarged schematic side sectional view of the main part of the sand settling and cleaning tank 10 part. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2; FIG. 4 is a sectional view taken along line BB in FIG. 3; FIG. 4 is a diagram showing a state in which the screen 29 and air supply piping 31 shown in FIG. 3 are removed. It is a back view of the screen 29 and the air supply piping 31 seen from the bottom side. 7(a) is a plan view of the tip side portion of the air supply piping 31, FIG. 7(b) is a cross-sectional view taken along line CC in FIG. 7(a), and FIG. 7(c) is a bottom view thereof. . It is an explanatory diagram of the operation of the sand settling and cleaning device 1 in the vicinity of the screen 29 and the air supply pipe 31.

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic side sectional view of a sand settling and cleaning device 1 according to an embodiment of the present invention. As shown in the figure, the settling and cleaning device 1 includes a settling and cleaning tank 10 into which settled sand is charged and washed, and a settling and cleaning conveyor 70 installed at the inner bottom of the settling and cleaning tank 10. . The sand discharge conveyor 70 is installed so as to be inclined upward from the upstream side toward the downstream side in the sand discharge direction (arrow A direction). The sediment (pre-washing sediment) introduced into the sediment washing tank 10 from the sediment receiving tank 15 (described below) is washed by washing water supplied into the sediment washing tank 10, then settles, and is then settled and washed by the sediment carrying conveyor 70. It is carried out to the outside of the tank 10.

2 is an enlarged schematic side sectional view of a main part of the sand settling and cleaning tank 10 portion of the sand settling and cleaning apparatus 1, and FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2. As shown in FIG. 2, the sand settling and cleaning tank 10 is a tank formed in a substantially rectangular parallelepiped shape, and an air pump 17 constituting an air supply means is installed at a predetermined position above the tank. A washing water supply means (hereinafter referred to as "washing water pipe") 19 is installed on the upstream side of the sand settling and cleaning tank 10 (on the right side of the figure), and a rectangular opening is installed on the downstream side of the sand washing tank 10 (on the left side of the figure). A wash water outlet (wash water drainage channel) 21 is provided.

A sediment receiving tank 15 is attached to the upper surface of the sediment cleaning tank 10, and is configured so that sediment before cleaning can be thrown into the sediment cleaning tank 10 from a sediment inlet 22 provided at the lower end of the sediment receiving tank 15. There is. A pair of stirring means (hereinafter referred to as "stirring blades") 23 is installed on both left and right sides of the sand settling and cleaning tank 10. The stirring blade 23 is rotationally driven by a stirring motor 25 shown in FIG.

A sand discharge opening 27 is provided on the downstream side of the inner bottom of the sand settling and cleaning tank 10 , and the sand discharge opening 27 is covered with a screen 29 . An air supply pipe 31 constituting an air supply means is installed on the lower surface side of the screen 29. 4 is a sectional view taken along the line BB in FIG. 3, and FIG. 5 is a diagram showing a state in which the screen 29 and air supply pipe 31 shown in FIG. 3 are removed. As shown in these figures, the sand discharge opening 27 has a substantially rectangular shape and is formed so as to be inclined obliquely upward from the upstream side toward the downstream side. A concave screw accommodating portion 73 that accommodates the sediment discharge screw 71 is provided at the bottom of the sediment discharge opening 27 . A sediment conveyor 70 is constituted by a sediment conveyor screw 71, a screw storage section 73, and the like.

FIG. 6 is a back view of the screen 29 and the air supply piping 31 attached to the lower surface of the screen 29, viewed from the lower surface. As shown in these figures, the screen 29 is configured by forming a plurality of openings (hereinafter referred to as "openings") 33 for passing through the sand in a plate that covers the upper part of the sand transport conveyor 70, and in this example, the screen 29 is made of a metal plate. Punching metal is used in which a large number of circular openings 33 are formed. As shown in FIGS. 3 and 6, the opening 33 is formed so that the upstream region E1 of the screen 29 is coarse (that is, the inner diameter is large), and the downstream region E2 is formed narrowly (that is, the inner diameter is small). . The hole diameter and pitch of the openings 33 in the region E1 are Φ10 mm×P15 mm in this example, and the hole diameter and pitch of the openings 33 in the region E2 are Φ5 mm×P8 mm in this example. Thereby, the opening 33 located in the area E1 allows larger settled sand to pass through, and the opening 33 located in the area E2 allows smaller settled sand to pass through. Note that the portion constituting the region E1 and the portion constituting the region E2 of the screen 29 may be separate parts, and the two may be joined together.

At predetermined positions on both the left and right sides of the screen 29 along the upstream and downstream directions (in this example, at three locations near the center and both ends), projecting from both sides in the width direction (direction perpendicular to the upstream and downstream direction). A screen support portion (rib) 35 is provided. In this example, the screen support portion 35 has a flat rectangular shape, and is bent from the surface of the screen 29 and directed diagonally upward. The reason why the screen support part 35 is formed to face diagonally upward is that, as shown in FIG. This is because the slope is set to match the slope. Note that the screen support portion 35 may be constructed as a separate component from the screen 29 and joined to the screen 29.

7(a) is a plan view of the tip side portion of the air supply piping 31, FIG. 7(b) is a cross-sectional view taken along line CC in FIG. 7(a), and FIG. 7(c) is a bottom view thereof. . As shown in these figures, the air supply piping 31 is constituted by a synthetic resin pipe, and a first pipe section (air supply section) 37 extends from the upstream side to the downstream side on the lower surface side of the screen 29. and a second pipe part (air ejection part) 39 extending from the upstream end of the first pipe part 37 in a direction crossing the first pipe part 37 . That is, the tip portion of the air supply pipe 31 is formed in a T-shape. Both left and right end portions of the second pipe portion 39 are closed, and a plurality (four) of air jet holes 41 are provided on the lower surface thereof. The other end of the air supply pipe 31 is connected to an air discharge pipe 43 connected to the air pump 17, as shown in FIG.

The air supply pipe 31 is installed on the lower surface side of the screen 29, and at this time, the second pipe portion 39 is placed near the upstream end of the screen 29. Although the air supply pipe 31 is fixed to the screen 29 by a fixing means (not shown), it does not necessarily have to be fixed to the screen 29. Further, the connection position between the air supply pipe 31 and the air discharge pipe 43 is set at a position higher than the water level of the cleaning water in the sand settling and cleaning tank 10, so that the connection part is not tangled with scum or the like.

As shown in FIG. 1, the grit carrying out conveyor (draining conveyor) 70 includes a screw storage section 73, a sand settling carrying out screw 71 stored in this screw storing section 73, and a position near the downstream end of the sand settling carrying out conveyor 70. It is equipped with a screw drive section 75 installed in the main body, and a sediment discharge section 77. The screw storage section 73 has a concave portion installed at the bottom of the sand settling and cleaning tank 10 and a cylindrical portion that projects from the sand settling and cleaning tank 10 to the outside. The screw drive unit 75 includes a screw drive motor 79 installed near the downstream end of the screw storage unit 73 and a power transmission mechanism 81 that transmits the power of the screw drive motor 79 to the sand sedimentation screw 71. It is configured. Near the downstream end of the screw storage section 73, a sand settling section 77 that is open downward is formed. The sand discharged from the sand discharge section 77 is transferred to a sand hopper (not shown) that stores the washed sand by a washed sand transporter 85 consisting of a belt conveyor.

Next, the operation of the settling and cleaning device 1 installed in a sewage treatment plant will be explained. FIG. 8 is an explanatory diagram of the operation of the screen 29 and the vicinity of the air supply pipe 31. First, in FIG. 1, in-house miscellaneous water of a sewage treatment plant is supplied as washing water from a washing water pipe 19 into a sediment washing tank 10, and is drained from the washing water outlet 21. The drained wash water passes through, for example, a drainage channel (not shown) and is led to a pump well (not shown). By simultaneously driving the air pump 17, as shown in FIG. 8, air (bubble b) is ejected (aerated) from each air ejection hole 41 of the air supply piping 31. The bubbles b ejected from each air ejection hole 41 rise toward the downstream side of the screen 29 while following the slope of the lower surface of the screen 29. The bubbles b move to the upper surface side of the screen 29 through each opening 33 on the way to rising, and rise inside the sand settling and cleaning tank 10.

Next, pre-washed sediment collected from a not-shown settling tank in the sewage treatment plant is introduced into the settling cleaning tank 10 from the settling port 22 via the settling tank 15 shown in FIG. At the same time, the screw drive motor 79 and stirring motor 25 are driven to rotationally drive the sand removal screw 71 and stirring blade 23.

The pre-washed sand mixed with residue that has been put into the settling and cleaning tank 10 is agitated by the washing water being stirred by the stirring blade 23, and the sediment and residue are separated and washed. In the present invention, the pre-washed sediment is further agitated by the air bubbles b (see FIG. 8) ejected from the air supply pipe 31, so that the sediment is washed more effectively.

After washing the pre-cleaning sediment, as shown in FIG. 8, the heavy specific gravity sediment (post-washing sediment) a (a1, a2) settles in the sediment cleaning tank 10, passes through the opening 33 of the screen 29, and is then fed to the screw. Move into the storage section 73. There are two types of settled sand: large settled sand A1 and smaller settled sand A2. On the other hand, the residue having a light specific gravity is discharged together with the washing water by overflow from the washing water outlet 21.

Since the screen 29 is installed at the bottom of the settling and cleaning tank 10, the residue that settles inside the settling and cleaning tank 10 is larger than the opening 33, and the residue cannot pass through the opening 33. It is discharged from the discharge port 21. Also, the residue is smaller than the opening 33 and tries to pass through the opening 33, but since air bubbles are ejected from the opening 33, the residue has a light specific gravity and cannot pass through the opening 33. It is discharged from the exit 21.

The washed sediment that has passed through the screen 29 as described above is scraped up and transferred downstream by the rotation of the sediment discharge screw 71, and is discharged from the sediment discharge section 77 shown in FIG. The washed sand discharged from the sand discharge section 77 is transferred to and stored in a sand hopper (not shown) by a washed sand transporter 85.

As explained above, according to the sand settling and cleaning apparatus 1, by providing the screen 29, it is possible to effectively prevent the sludge from entering the sand sludge conveyor 70 (the screen 29 serves as a sludge removal means). Furthermore, by supplying air from the lower surface side of the screen 29, it is possible to more effectively prevent the scum from entering the grit transport conveyor 70, prevent clogging of the openings 33, and prevent these Therefore, high quality sediment a can be recovered. That is, as mentioned above, one of the roles of the air supply means is to aerate the inside of the sand settling and cleaning tank 10 for stirring and cleaning, and the other role is to supply the sediment while preventing the openings 33 of the screen 29 from clogging. This is to prevent the particles from passing through the opening 33.

When the diameter of the opening 33 provided in the screen 29 is increased, it becomes easier for the residue to pass through the opening 33, so it is preferable to make the diameter of the opening 33 as small as possible in order to separate the residue from the sand a. However, if the diameter of the opening 33 is made smaller, the larger sediment a1 will not be able to pass through the screen 29. Therefore, in this embodiment, the screen 29 is provided with both coarse openings 33 and fine openings 33. When providing the coarse and fine openings 33, if the coarse openings 33 are provided on the downstream side, the larger sediment a1 that has settled on the upstream side will not be able to pass through the screen 29. For this reason, in this embodiment, by providing the coarse openings 33 in the upstream area E1, even if the larger sediment a1 that could not pass through the narrower openings 33 in the downstream area E2 passes over the slope of the screen 29. By rolling down toward the upstream side, it reaches the upstream area E1, thereby allowing it to pass through the screen 29. This effectively prevents the scum from passing through the screen 29, and at the same time allows the settled sand a of all sizes to smoothly pass through the screen 29. This effect can be increased by setting the region E2 on the downstream side wider (longer) than the region E1 on the upstream side.

Further, in this embodiment, the reason why the air jet holes 41 are provided only on the upstream side of the screen 29 is as follows. That is, if the air jet hole 41 is also provided in the first pipe section 37 of the air supply pipe 31, the air discharge from the air jet hole 41 provided in the second pipe section 39, which is deep in water, will be weakened. It is. Therefore, the tip of the air supply pipe 31 is made T-shaped, and four air jet holes 41 with large hole diameters are provided, and the air jetted from these four air jet holes 41 is sent to the screen 29 as described above. By raising it along the back surface, air can be reliably supplied from the opening 33 located on the most upstream side to the opening 33 located on the most downstream side.

Furthermore, in this embodiment, the air outlet 41 is provided facing downward (directly below in the embodiment) in order to prevent the air outlet 41 from being blocked by sedimentation or the like due to backflow even when the air pump 17 is stopped. It is.

The washed sediment stored in the sand hopper (not shown) as described above has a low moisture content and is light in weight because it contains less residue such as food waste. It is possible to extend the period of unloading.

In the method of operating the sand settling and cleaning apparatus 1, the washing water is injected through the washing water pipe 19 and the air is aerated from the air outlet 41 at all times, while the sand transporting screw 71 and the stirring blades 23 are driven before washing. It is preferable to carry out this process for a predetermined period of time starting from (or before or after) when the sand is put into the sand washing tank 10. With this configuration, aeration and washing water injection are carried out at all times, so it is possible to continue separating the residue from the sand that has been previously input and remains in the sand washing tank 10. This is because the settling and cleaning effect can be further improved.

Incidentally, in the above embodiment, a punched metal is used as the screen 29, but the present invention is not limited to this, and any screen having any configuration may be used as long as the screen is provided with openings for passing through the sediment. It may be a screen. For example, as in the above embodiment, a structure may be adopted in which a plurality of openings 33 for passing through the sand are formed in the plate covering the upper part of the sand settling conveyor 70, or a structure may be adopted in which a plurality of openings 33 for passing through the sand are formed, as in the case of a bar screen. It may have a structure in which a plurality of bars are installed in parallel with a gap between them, or it may be constructed from a mesh plate.

Further, since the screen 29 according to the above embodiment is provided with the screen support portions 35 on both the left and right sides thereof, the screen support portions 35 are attached to the left and right sides of the upper part of the sediment discharge opening 27 of the sediment cleaning tank 10, as shown in FIG. It can be easily attached and detached by simply touching it on both sides (or fixing it in that state). Although the screen support part 35 is constructed as a part of the plate that constitutes the screen 29 in this embodiment, it is constructed as a separate part from the plate that constitutes the screen 29, and the two are fixed by welding, bolts, nuts, etc.・It may also be configured to be joined. Since the screen 29 according to the present embodiment can be easily attached and detached, for example, depending on the condition of the inflow, that is, the condition of the settled palm sludge, the screen 29 may have different hole diameter sizes and regions E1 and E2. Changes to the screen 29 can also be easily made.

As explained above, the sand settling and cleaning device 1 includes a sand washing tank 10 in which sand is charged and washed, and a structure in which the inner bottom of the sand washing tank 10 is inclined upward from the upstream side to the downstream side in the sand discharge direction. The sediment cleaning device 1 has a sediment carrying-out conveyor 70 that is installed, and carries out the washed sand that has been introduced into the settling cleaning tank 10 to the outside of the settling cleaning tank 10 by the settling carrying-out conveyor 70. Since the upper part of the sand conveyor 70 located at the inner bottom of the sand filter 10 is covered with a screen 29 having an opening 33 large enough to pass through the sand, the screen 29 can separate the sediment from the sand. The amount of sediment in the sand that passes through the screen 29 and is carried out by the sand carrying conveyor 70 can be effectively reduced. Therefore, the settled sand after being carried out can be reliably treated as general waste, and disposal costs (carrying costs) can be reduced.

In addition, since the residue in the sand being carried out can be suppressed, the moisture content of the sand being carried out is reduced, and even if the sand is stored in a sand hopper, for example, drops falling from the sand hopper are suppressed, reducing odor. It is also planned to Further, by reducing the water content, the weight of the settled sand can be reduced, and the transport span (unloading cycle) of the settled sand can be lengthened. Moreover, according to the present sand settling and cleaning apparatus 1, the structure is simple in that the upper part of the sand settling conveyor 70 is covered with the screen 29, so that the installation cost can be reduced.

Further, in the above-described sand cleaning device 1, an air supply means consisting of an air supply pipe 31 for supplying air and discharging it upward from the opening 33 of the screen 29 is installed on the lower surface side of the screen 29. It is possible to prevent the opening 33 from being blocked (clogged) by the residue that has settled on the surface of the opening 33. At the same time, by supplying air (aeration) into the settling and cleaning tank 10, a water flow is generated, and the stirring and cleaning of the settled sand is carried out more effectively, thereby promoting the separation of the settled sand from the residue. Cleaning can be performed more effectively.

Further, according to the sand settling and cleaning device 1, since the air jet holes 41 of the air supply pipe 31 are provided on the upstream side of the lower surface of the screen 29 installed diagonally, the air jetted from the air jet holes 41 is transferred to the screen. Air can be guided from the upstream side to the downstream side along the lower surface of the screen 29, and the air can be released from the openings 33 throughout the screen 29, thereby preventing each opening 33 from being blocked. Further, the inside of the sand settling and cleaning tank 10 can be aerated over a wide range and can be stirred.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the claims and the technical idea described in the specification and drawings. It is possible. Note that any shape, structure, or material that is not directly described in the specification or drawings is within the scope of the technical idea of the present invention as long as it achieves the action and effect of the present invention.

For example, in the above embodiment, aeration with air was performed in order to prevent clogging of the screen 29, but instead of this, it is possible to apply a stream of water to each opening 33 of the screen 29 or to wipe the screen 29 with a scraper. May be used. Further, in the above embodiment, the residue and the like separated from the sediment are discharged together with the wash water from the wash water outlet 21 by overflow, but it may be discharged by pumping up, for example.

Further, in the above embodiment, the air pump 17 is used to supply air to the air supply piping 31, but any configuration that can supply air may be used. For example, other equipment in the sewage treatment plant ( For example, air may be supplied by laying piping from a blower or compressor used in a blower equipment or air source device.

Further, in the above embodiment, an example in which the openings 33 have two sizes has been described, but the openings 33 may have three or more sizes. In that case as well, it is preferable to provide the larger opening 33 on the upstream side. Further, depending on the case, the size of the opening 33 may be one type.

Further, in the above embodiment, the cleaning water is stirred by the stirring blade 23, but if stirring the cleaning water by air from the air outlet 41 is sufficient, the operation of the stirring blade 23 may be stopped. Alternatively, the installation of the stirring blades 23 and the stirring motor 25 may be omitted.

Furthermore, the embodiments described above and shown in the figures can be combined with each other as long as there is no contradiction in purpose, structure, etc. In addition, the above description and the contents of each figure, even if only a part thereof, can be an independent embodiment, and the embodiment of the present invention is an embodiment that combines the above description and each figure. It is not limited to.

1 Sediment cleaning device 10 Sediment cleaning tank 15 Sediment receiving tank 17 Air pump (air supply means)
19 Washing water pipe (washing water supply means)
21 Washing water outlet (washing water drain)
22 Sand inlet 23 Stirring blade (stirring means)
29 Screen 31 Air supply piping (air supply means)
33 Opening (opening for sand insertion)
41 Air outlet 70 Sediment carrying-out conveyor 71 Sediment carrying-out screw 73 Screw storage section a Sediment a1 Larger sediment a2 Smaller sediment b Air bubbles E1 area E2 area

Claims (4)

A sediment cleaning tank that pours sediment and cleans it,
A sediment conveyor conveyor is installed at the inner bottom of the sediment cleaning tank so as to be inclined upward from the upstream side toward the downstream side in the sediment discharge direction,
In a sand-sand cleaning device, the sand washed by being introduced into the sand-settle washing tank is carried out to the outside of the sand-settle washing tank by the sand transport conveyor,
The upper part of the sand conveyor located at the inner bottom of the sand washing tank is covered with a screen, and the screen is provided with a sand insertion opening sized to allow the sand to pass through,
The sand penetration opening is characterized in that the upstream region of the screen is coarse and the downstream region is narrow, and the downstream region is set wider than the upstream region. Sand settling and cleaning equipment. The sand settling and cleaning device according to claim 1,
A settling and cleaning device characterized in that an air supply means is installed on the lower surface side of the screen for supplying air and discharging the air upward from the opening for passing through the settling of the screen. The sand settling and cleaning device according to claim 2,
The air supply means is configured by providing an air jet hole on the upstream side of the lower surface of the screen, and guides the air jetted from the air jet hole from the upstream side to the downstream side along the lower surface of the screen. A sand settling and cleaning device characterized in that air is released from each of a plurality of sand settling openings formed in a screen. The sand settling and cleaning device according to claim 1,
A sediment cleaning device characterized in that means is provided for applying a water stream to each of the sediment insertion openings of the screen to prevent clogging.

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